A peak flow meter is used to measure your peak expiratory flow rate (PEFR). PEFR describes how quickly your lungs expel air during a forceful exhalation after you fully inhale. Regularly conducting a ...

Martin Wright, who died on March 4th aged 88, was a prolific medical inventor, whose instruments have helped millions of people… Martin Wright, who died on March 4th aged 88, was a prolific medical ...